Subsea lateral drilling

摘要

A method for drilling a borehole in a producing subsea wellbore wherein a flexible conduit (6) is connected at one end to a surface vessel (2) and at the other end via a pressurized subsea wellhead (16) to the producing wellbore (14) such that a remotely operated electrical drilling device (RODD) can be deployed down the flexible conduit, the method comprising:
directing a RODD (8) to the location for drilling in the wellbore; and
drilling a further wellbore section with the RODD;
wherein the drilling comprises drilling in underbalanced conditions with respect to the formation; and using fluids produced from the formation to transport the drill cuttings away from the drilling device.